Methods

The anteroposterior and transverse diameters of the pelvic inlet, the interspinous diameter of the midpelvis, and the intertuberous diameter of the pelvic outlet were measured.

Post hoc power analysis showed that 22 women were needed in each group to detect a 10% difference in the pelvic dimensions between groups, with an alpha error of 1% and a bêta error of 10%, resulting in a 90% power.

Results

Mean (± standard deviation [SD]) age of the subjects was 63.4 ± 8.3 years, compared with 62.9 ± 7.8 years for controls.

Mean parity of the subjects was 3.3 ± 1.7, compared with 3.6 ± 1.7 for controls.